YMF721 datasheet(4/41 Pages) LSI

4 / 41 page

YMF721

July 10, 1997

- 4 -

Others : 39 pins

Pin name

pins

I/O

Type

Size

Function

5V/3V

CMOS

Selection of power supply

/RESETSEL

I+

TTL

RST signal polarity control pin

(When this pin is at "L", RST is active at "L".)

/PDOUT

CMOS

2mA

Power down control output

CMOS

2mA

Crystal oscillator connection or master clock input

(33.8688 MHz)

CMOS

2mA

Crystal oscillator connection pin

N.C.

To be open at normal use.

LSI test pins : 21 pins

Pin name

pins

I/O

Type

Size

Function

/TESTA

I+

TTL

To be open at normal use.

/TESTB

I+

TTL

To be open at normal use.

/TEST

I+

TTL

To be open at normal use.

/TEST2

I+

TTL

To be open at normal use.

/TEST3

I+

TTL

To be open at normal use.

T7-0

CMOS

2mA

To be open at normal use.

TD7-0

I/O

CMOS

2mA

To be open at normal use.

Power supply, ground : 11 pins

Pin name

pins

I/O

Type

Size

Function

VDD

Power supply (put on +5.0 V or +3.3V)

VSS

Ground

Total : 100 pins

Note : I+ : Input pin with built-in pull-up resistor, OD : Open drain output pin

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